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JEE Main Physics question

PhysicsSystems of Particles and Rotational MotionJEE Main

A bullet of mass m moving with velocity v strikes a block of mass M at rest and gets embedded into it. The kinetic energy of the composite block will be [MP PET 2002]

Answer: (A)

Solution

By momentum conservation, V = mv/(m+M). KE of composite = ½(m+M)V² = ½(m+M)[mv/(m+M)]² = ½mv² × m/(m+M).

Question ID VK-154120